Bonnell Spring Made Mattress is quilted with knitted fabric in combination with high density foam having a thickness of 40mm. The Mattress comes with a thickness range from 153mm to 254mm and is equipped with high tempered Bonnell springs. The Mattress helps to maintain the natural’s shape of the spine and gives proper back support for comfortable sleep. Bonnell Spring Made Mattress is available with non woven mesh that acts as an insulator and is also featured with a helical wire diameter of 1.4mm.